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How about a live event at the school that could be broadcast over the web around the globe? Providers like On24 have systems where you can hold virtual events that allow interactive meetings, speakers, breakout groups, etc. I'm assuming you would use this as a recruiting opportunity, too so it might provide an interesting way to introduce people to the school who can't travel for the event.
I went to an all girls boarding school and whenever we held events they were well attended by prospective students, current students and alumni. Of course, that was in the old days before the web so we did it all on campus but you may be able to create a virtual event that has the same vibrancy.